Bearing for rotary pumps



Oct. 20, 1931.

W. l. DERRICKVVA BEARING FOR ROTARY PUMPSv Fi'ledMay 4, 1922 2. sheets-snee; 1

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w. l. DERRICK BEARING FOR ROTARY PUMPS Filed May 4, 192

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WILLIAM I. D E'RRICK, OF DAVENPORT, IOWA, ASSIGNOR TO WESTCO PUMP COMPANY,

OF DAVORT, IOWA, A CORPORATION OF DELAWARE Emme son nornnyrnmrs application sled nay 4, 1922. serial No. 558,451.

This invention relates to rotary pumps and more particularly to the type 4in which' a single rotor is mounted tov rotate between easparts of the casing and rotor, orby annular .alinement of the shafts and will'take up .the

ribs formed on the inner faces of the side Walls of the casing between which the rotor disk has a close working fit. l

This invention relates also to rotaryipumps in which there is more or less of a clearance between the rotor and the casing and. itis desired to center the rotor with respect to the casing walls. In many such pumps it is usually desirable that the clearance between the ribs and disk be made as small'as possible without frictional engagement, but this of course-variesaccording tothe uses and designs of the various pumps.

It is the object of this invention to provide means for so mounting the rotor shaft that. it is firmly held against. any longitudinal play during operation so that the rotor is rigidly centered during operation with respect tov the ribs or casing walls, as the case may be.

A further object is to provide means for adjusting the rotor shaft to center the rotor disk whereby any misalinem'ent can be corrected. v

Another object'of the invention isi-to provide a coupljng'between the motor shaft and rotor shaft so that they may be independent and the coupling will compensate for misthrusts of the motor shaft, prevent noisy operation due to inertia or variations of speed of either shaft and permit relative slight' longitudinal movement of either shaft. Viv

brations in the rotor- Vand casin are -thereby lessened, which tend to cause 'cti'onal engagement between the ribs and rotordisk,7 ,so that the rotor and casing maybe com structed with a closer working fit than' heretofore possible. f

In the annexed drawings forming a part 'of thisspecication,

Fig. 1 is a view showing a central transverse section through the pump, together with the motor for driving the pump, the 'niotor being shown in sideelevation. .Figure 2 "s an enlarged section through one end of the shaft and its bearings.

Figure 3 isan end view taken on line 3--3 and looking in the direction ofthe arrow of the bearing support and adjusting nut. Figure 4 is a plan view of one of the ad- ]usting nuts.

Figure 5 is a section on line 5 5 of'Fig. 4. Figure 6 is a section on line 6-6 of Fig. 1 showing the pump in side elevation. F lgure 7 is a detail View showing the sha coupling. in side'elevation.

` Figure 8 is a front elevation of the coupling member carried by the end of the rotor Figure 10 is a sideelevation ofthe coupling member carried by the motor shaft.

Figure 11 is a perspective view of the collar detached.

Referring to the drawings, a base 1 supports a pump casing 2 and a motor3. The :Y

pump casing 2 conslsts of two separate cast-A ings 4 and 5, the casting 4 formed to provide the body of the rotor -housing and an integral base portion 6, andthe casting 5 formed to provide a cover plate at one side of the rotor housing. l The 'castings 4 and'5 have integral tubular packing 4bosses 7 and 8 axiallyof the 'rotor housing. Integral bearing bracket'arms 9 and 10 extend laterallyfrom the sides ofthe casing 2 and have threaded apertures 11 and 12 therein in axial alinement with the'packing bosses 7 and 8 on the pump casing, A shaft 13 extends axiallythrough the pump casing 2, bosses 7 and 8, and'apertures 1:1 and 12.

Packing glands 14 Vscrewed into the outer ends of the tubular'bosses 7 and 8 serve to: hold the packing in place about the shaft 13 on opposite slides of the casing 2. A rotor' '1'5 is fixed to the shaft 13 within the casing 2. Annuler ribs 16 on the inner faces of the casing walls have a close working fit with the rotor 15. vWithin the aperture 12; in the arm 10 the shaft 13 is journaled in a ball-bear ing of the -s`o-called self-aligning type. The bearing has an inner collar or inner race which is clamped upon the'reduced end 18 of the shaft 13 against the shoulder at* the end of the reduced portion, by means of a nut 19, and an outer collar or race 20 forming with the collar 17 a complete. race for the balls 21. Nuts 22and 23 screwed into the aperture 12 have rims to engage opposite 'sides -of the outer bearing collar or race' 20 circumferentially, and consequently when they are turned they move the race bodily which moves the shaft axially. The nuts 22 and 23 are provided 'with recesses to receive a Spanner wrench whereby they can be adjusted. The adjustin'g nut 22' is provided with a kerf`24 extending'from the periphery on one side mre than'half Way through the same. An aperture for a screw 25 is formed 'pao closely through the divided portion of the nut, the aperture being threaded at one side of said kerf so that the screw 25 can draw the twov parts of the nut 22 together at the kerf'to pinch the threads together at one side of the'. nut and to. lock the nut in adjusted position. The outer nut 22 is recessed to accommodate theend of the shaft 13 and vthe clamping nut 19, and to-provide a peripheral flange engageable with the outer race 20.

In the aperture '-11 inthe bracket'arm 9 on the opposite side ofthe pump casing is mounted a bearin 26-'similar in allrespects to the bearing in t e aperture 1 2, and adjusting nuts 27 and 28 corresponding to the nuts 22 and 23 and-having rims to engage the-outer race of the b earin 26'to clamp the'bearing and consequently t e 'shaft in adjusted position. The shaft 13 extends through the aper o ture' 11 to enable the end thereof to be coupled 4 to the motor drive. shaft. The inner race of the bearing 26 is mounted upon the reduced end portion 29 ofthe shaft 13 and is clamped against the shoulder at the inner endpof the reducedportion 29 by means of a sleeve 30 clamped between the bearing 26 and the nut 31 o n the'e'nd of the shaft.

The motor 3 has a shaft 32 substantially in alinement with the shaft 13 and terminating adjacent to the end thereof. A coumember 33 isfxed to the reduced end the shaft 13 and has aA pairof lugs pling 29 of j which is mounted therectangular cushioning member 35, preferably of rubber.' A coupling member 36 is fixed to the motor shaft 32 at its end adj acent the shaft 13. The r coupling member 36 is provided'with a recessed portion between fside lug's'37 of a size to receive the lugs 34 with ythe cushioning member 35 thereon. Coupling members 33 and 36 form an interengagmg` inal movement is permitted between the motor shaft and rotor shaft and 'the cushioning member 35 serves to lessen the transmission ofvibratons or driving strains the shaft.

driving connection in which v resem] from the motor shaft to the rotor shaft. t "y alse compensates forvthemo'to'r shaft and' rotor shaft being relatively slightly out of alinement.

By' means of the adjusting nuts engaging the ball bearings in the apertures 11 and 12 the' rotor shaft can be adjusted to accurately center the rotor in the pum casing and the of any suitable material such as rubb'er,lfibre,

. etc., to throw of centrifugally any water that may escapefrom the-packing gland or get on the shaft 13 from any other sourceto revent-the water following the shaft 13 1nto the bearing chamber and consequently rusting or corroding the bearings.

In assembling the parts, the shaft 13 with Vthe rotor securedthereto is slipped into the pump casingll with the gland nut 14, th

disk 40', the adjusting nut 28, and the bearing 26 mounted on one end, and with the casing cover `5 and similar parts mounted on ,the other side of the pump casing, the nut 19 being also secured to the shaft 13 to tightly clamp the bearing against the shoulder of The sleeve 30 may be applied 13e-'the reduced yportion 29 of the shaft-1 either before or after the shaft is mounted 1n the casing and bearing supports.'l The.

coupling member with its key 41 and thcnut 31 arejthen secured to thereduced portion29 of the shaft "13, the nut 31 forcing i the coupling sleeve and bearing tightly together and holding the' bearing' against the shoulder of the shaft 13. The casing cover maybe -then secured in place by suitable means, such as the nuts disclosed herein, and

the gland .nuts`14 tightened. The adjusting nuts 22, 23, and 27, 28 with their rims engaglng the outer races of the bearings can then be adjusted and locked in place so that 'the rotor is rigidly held in position in the casing to freely turn between the casing and cover and does Vnot bear against either of them.

vFurthermore, the particular forms of apparatus shown and described, and the particular procedure set forth, are presented for thepurposesof exlplanation and illustration, and that various "it is tolte imdersfood thai modifications of said `'apparatus and rc2 l cedure can be made without de arting' om my invention, as designed' in't e appended.'

claims. l l

Having thus described my invention, what I claim 1s:

Y 1. In combination, a fixed support, an internall y forme in said support-a `slwuldered shaft.

threaded bore open at both ends I ternally threaded bore open at bot 4 threaded ection lengaging an inner ball race rigidly said shoulder and arranged between the ends of said bore, an outer race separated from said inner race by -a plurality of balls, an adjusting member threaded in one end of said bore and engaging said outer race and,

a second adjustable member threaded in the other end of said bore and enga ing said race, whereby the shaft may be adjusted axially by adjusting said members.

. 2. In combination, a fixed support, an h ends formed lin said support, ashoulderedshaft, an inner ball race rigidly clamped against, said shoulder and arranged-betweenthe ends of said bore, an outer race separated from said innerrace by a plurality of balls, an adjusting member having an annular proone side of said outer race threaded in one end of said bore, a second adjusting member having an annular projection engaging the other side of said outer race in the other end of said bore-whereby said s/haft may be adjusted axially, and

means to lock said members `in adjusted position.

3. An adjustable mounting for pump shafts and the like, comprising a iixed support having a bore open at both-lends and internally threaded, a shaft extending into said bore, a ball bearing on the shaft within said bore comprising an inner race ring, an outer race ring of a size within the bore and`circumferential rows of balls interposed between'the rings, said inner race ring being secured to Ithe shaft and rigidly held against axial movements thereon, and means for rigidly securing-the outer race ring to the support in different positions ax ially of said bore, whereby said` shaft may be adjusted axially and rigidly heldin adjusted position, said means comprising externally threaded nuts'screwed into opposite ends ofy said threaded bore and clamping said outer race ring to rigidly hold the same in xeddpositions within the bore, said nuts being'a ustable, one independently of the other, whereby said outer race rin may be adjusted axially in the bore an rigidly clamped in different positions of adjustment.

In srtimony signa e.

. I. DERBICK.

clamped against l to substantially it` whereof, I hereunto allix my 

